so, if i actually thought that white people were dominant everywhere throughout history, then a different truth would be self-evident - white people would clearly be a superior race. the evidence would present that as an empirical fact, and that would be the end of it.
but, it's not actually true, though - history demonstrates that no one race is more likely to assert dominance over any other for any substantive period of time, that subjugation always leads to revolt and that migration is essentially always a violent process full of conflict, not a peaceful one full of integration.